C/E/X PA Flat to 30 (FT30) PA TH Awesomeness - Page 51 - diyAudio
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Old 7th January 2012, 01:45 AM   #501
Djim is offline Djim  Netherlands
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That is for two drivers per cab???
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Old 7th January 2012, 02:22 AM   #502
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Originally Posted by Djim View Post
That is for two drivers per cab???
Not to my knowledge. Does something in the HR screen suggest this? Maybe I missed something (very possible).
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Old 7th January 2012, 02:34 AM   #503
Djim is offline Djim  Netherlands
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Look at TH value, it says 2P (2 drivers in parallel) and under that you see 2 x SD. Besides that, these are the parameters of the old version of the 3015lf... But at least you understand my first question now and that it becomes a little foggy.

Last edited by Djim; 7th January 2012 at 02:37 AM.
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Old 7th January 2012, 03:28 AM   #504
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OMG! I was unaware that driver arrangement doesn't reset to "1" when creating a new enclosure. I bet it's due to pressing "add" after a PPSL design I modeled. My apologies. Now I must go back to readjust parameters. The response I was getting looked too good to pass up. Now I know why

Here's what Eric gave me to work with. The driver parameters are different from both old & new spec sheets I have. He suggested S values to range from 1000-1500.

ID=28.00
Ang=2.0 x Pi
Eg=44.72
Rg=0.00
Fta=0.00
S1=1100.00
S2=1100.00
Par=0.10
F12=0.00
S2=1100.00
S3=1100.00
Par=0.10
F23=0.00
S3=1100.00
S4=1100.00
Par=220.00
F34=0.00
S4=1100.00
S5=1100.00
Par=20.00
F45=0.00
Sd=881.10
Bl=17.00
Cms=1.36E-04
Rms=2.99
Mmd=82.73
Le=1.87
Re=5.50
TH=1
Vrc=0.00
Lrc=0.00
Ap1=0.00
Lpt=0.00
Vtc=4000.00
Atc=880.00
Pmax=100
Xmax=5.0
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Old 7th January 2012, 10:18 AM   #505
epa is offline epa  Netherlands
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correct.
a straigt pipe ranging from 1100 to 1500 cm2
@ 1500 giving the most eff,down low,but also more group delay there.1 drvr a cab.

i simmed both boxes and as expected there is not much difference ,the symetric model 1 having +.5db on 35 hz and the standart model 2 having + 1 db in the midle area.

i prefer the model 1 because i think the cone wil be symetricly stressed(remember 4pyros probs)
but bot wil work fine,especialy corner loaded.

about the ts ,1 or 2 parameters must be of i think its sd and/or bl. but it doesnt make much difference in the sim.
grtz erik
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db

Last edited by epa; 7th January 2012 at 10:24 AM.
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Old 7th January 2012, 12:43 PM   #506
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Quote:
(remember 4pyros probs)
Someday this winter I will fix that.
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Old 7th January 2012, 07:15 PM   #507
Djim is offline Djim  Netherlands
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Hi Crescendo and Epa,

Maybe it's an idea to enlarge the mouth to 4000cm^2 (or as large as the total front of the cab). The little loss at low end in favour for a gain of 2dB overall is something I should consider. In max SPL there is even more to gain than 2dB because the excursion lowers also with a 4000cm^2 mouth. The excursion max transfers from 44Hz to 50Hz (remember Fs of the driver is 44Hz) and the group delay imporves slightly. All in all that means significant less stress for the driver.

Click the image to open in full size.
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Old 7th January 2012, 07:35 PM   #508
Djim is offline Djim  Netherlands
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Click the image to open in full size.
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Old 8th January 2012, 01:21 AM   #509
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I might as well build epa's tbx box or Xoc1's 6 fold and load them w/3015LFs with an adapter ring until I have sufficient funds to purchase the proper 18" drivers. The 3015LF seems to model not so bad in either enclosure. Does the delay look a bit odd? What do you think?
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Old 8th January 2012, 01:48 AM   #510
Djim is offline Djim  Netherlands
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Wouldn't worry about the delays too much but so far nobody showed me any SPL measurement that proved the 3015lf is capable of controlled excursion more than 8.0mm (that was 8mm with high pwr compression figures).
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